Well Day 16, decided to sort this problem myself.
Rang Orange, told them the blackberry was faulty, display had stopped working.
Sent me out a new handset, arrived this morning, put in my sim card and hey presto, all working and connected to BIS!!!
So why could Orange not of done this 15 days ago when the fault was discovered.
From speaking to Orange it appears my original PIN was a duplicate from another handset, so someone else was using it, which was causing errors with the RIM servers.
Oh well, time to claim some money back from orange!